As I have noticed with the Aussie PHS, the handicaps are very much regional. That makes sense since the boats generally don't race between regions.
According to WIKI, PHRF also suffers from regional variations.
I would suggest that you try to find a SO35 racing elsewhere in Canada and also from the same fleet a SF37 or a SO37 and using their handicaps adjust for the BC fleet (I saw SF/SO37 are on the BC racing list). If you strike out, look at US handicaps